Power-transmission device



Dec., 2,' 1930. ciw. WEISS roman TRANSMISSION DEVICE Fiied March 2, 192s /NVENToR B CIPV( manteau. '2, 1930 PATENT o1-F1cE om w. wares, or nnooxii', new. Yom:

rowm'rnmsmssroir nnvrcn ,Application filed Karel: 2, 1929. Serial R0. 343,945.

This invention relates to power transmission devices of .the general character of that shown in Letters Patent of the United States N0.- 1,1 46,9s2, dated July 20,1915, in

5 which are comprised a nutating mutor, aA

cooperating body concentric with the mutor, one of said parts having a spherical surface and the other of said parts having gripping elements yto cooperate with the spherical surface and means to vary the relative am `gular position of said parts. In the embodiments of the invention illustrated in said Letters Patent and in several other' Letters. Patent covering modifications and adaptations ofthe principal invention, the gripping elements are-shown as supported` Y by the nutating body or mutor and as coacting with `a surrounding concave spherical surface. Since the inertia forces are ro- 29 portional to the weight and the square o the radius of gyration, such a construction, when driven at high speed, has been found to give rise 'to objectionable vibration, by reason' lof the radial distance of the gripping elements from `the axis. In another applica-V tion Serial No.'340,499, filed February 16, c 1929, ofthe same applicant as in the present case,'there is described and shown an embodiment of such principal invention in 30 which, in order to prevent as far as possible vthe development of objectionable vibration by reducing the inertia forces, the gripping elements are mountedin iixed bearings on' as a fixed support or housing and are external I sents a spherical surface of smallra'dius for coaction with the grip in elements.

In the present 'application there is shown andV described a further modification which,

is compact andA relatively vsimple in vconstruction and is well adaptedfor some uses. In the present case the spherical surface is carried by and rotates with the drivingshaft and the gripping elements which coact therewith are forme as' spherical bodies which are supported in a raeeway.. The latter is itself so su ported as to` be capable of nutation and ofp having its relative angular axial position varied for thepurpose of varying 5 the speed of rotationof the driven .part to to the nutating body or mutor, whichpr 'Through such coaction the reeeway dfrewhich it imparts rotary motion through a connection to lbe' descrlbed.' The nutating member is itself supported in proper operative relation with t'he coacting spherical member by a support which permits the .55

nutating member to -have its movement of nutation and at the same time acts as a reaction member.,

The invention will be more fully explained hereinafter with reference'tothe accompanyce ing drawing in which it is illustrated and inwhich': `i fr" Figure A1 is a. view in vertical,`sectio'nal elevation of a transmission device which em-l bodies the invention. r Figure 2 is a sectionalelevation ona plane at right angles to that of 'Figure 1, with both parts of the housing shown. In the embodiment of the invention illustrated in thedrawing a two-part housing Ic a, a1, is formed 'with a bearin boss ato l support the driving shaft,`wit l a bearing boss a to receivethe trunnion lof .the-supporting fork hereinafter mentioned, and

wi'h atubularextensiona* to support'the g55 driven shaft or member as hereinafterv described. The driving-shaft Ab has atits'end a member b1 v which vprovides the convex spherical' surface with whichv the initiating',v V member coacts. Invythe bea l boss a. is'eo received( a trunnionc of a. for ed'guidin and supporting member c1,"1the arms o Awhich are slotted,"as at cf'to receive the A collars d von the trunnions d1 of a raceway d2v external to the spherical`membeixz'Be-"86' tween the spherical surface b1 and the'ra'- way d are placed the gri ping elements e which in this instance are ormed as spheres and coact with the spherical surface '61,., l

ceives its movement ofnutation. The -forked support and guide c1, with its slotted'arm' c, supports the raceway d, through its trun- Anions, in such manner as to permit it to have such movementl of nutation and at the same 95 time maintains the' spherical member b1 -anjd the. gripping elements e vwith their ,centersv in the same plane. i

In order that hevmovement of natation l the element ormutor d may` be 1.0?

transmitted to the driven partand in order that relative angular position of the mutor n iay be varied as desired, the raceway d2 is y provided on one side with a cap or bridge da which'su ports a trunnion d. The latter is engaged y one end of a link f, the other end y o f-which has, as at fl, a pivoted or hinged joint with a driven part or shaft g. The lat'- -ter is received 'in a. ball bearing g1 which is seated in the tubular extension a* of the hous ing and is capable of being moved thereinv l y Y with the shaft g by any suitable means, such Y 8S a lever h, pivoted at h1 and engaging, by studs la a grooved collar g* held loosely on the the mutor stands' .substantially at right .an-

` 'gles kwith the axis of the driving shaft, in

which position the movement of nutation is mutor and the link f whic engages the mutor, a movement of rotation is imparted to the driven member or shaft g, the speed ofsuch su ai movement of rotation being fproportioned to the ar displacement o the mutor between t ezero position at right angles to the axis of thedriving shaft and the Vposition of l i maximum displacement shown in Figure 1.

Y The'supporting yoke c1 for the mutor is j fas held yieldingly in and is rammed te its initial vposition by rings c which are connected meente with the spherical member, means to support the mutor and the grippin element in alignment with the center of t e spherical member, and a connection between the mutor and the driven shaft.

3,*The combination of a driving shaft, a spherical member connected to and supported by the driving shaftfa driven shaft, a trunmoned mutor capable of natation, a gripping element su ported by the'mutor for coaetion with the sp erical member, a trunnioned yoke having slotted arms to receivetrunnions of the mutor, and a connection between the mutor and the driven shaft.

'This 'specication signed this 25th day of February, Al D. 1929. y CARL W. WEISS.

zero. Through the nutatin movement of the to the ends o the yoke 4and'rtb a stud a se? cured to the-housing a1. v

It will be understood that-for proper functioning for positive drive the gripping elements e andthe center of` curvature of the raceway d must'be maintained always: in alignment with Vthe center of the s herical member b1, this'b'eing accomplishe by the forked guide 'oi-. yoke c1 which maintains the raceway d concentric vwith the spherical member b1 while at the same time it, through the sliding of the trunnins in the slotted arms of the yoke, permits the free 'nutating movement of the raeeway or' mutor. f

I claim as my invention:

1; The. combination of Va driving shaft, a convex spherical' member connected 'to' and amutor capable of nutation and external to the spherical member, a gripping element supported by the mutor for coaction with the spherical member, and a connection v between the mutor and the driven shaft.

2. The combination of a driving shaft, a convex herical member connected to and sup rte by the driving shaft, a driven sha a mutor external to the spherical member and capable of natation, a gripping ele-` ment n supported by the mutor for coaction rted by the driving shaft, ia driven 

